Finding the Fourth Proportional to 114.42, 172.31 and 100.15

Step by Step Solution

1. Step 1: Write the proportion equation
   114.42 : 172.31 = 100.15 : x
2. Step 2: Convert to fraction form
   114.42/172.31 = 100.15/x
3. Step 3: Cross multiply
   114.42x = 172.31 × 100.15
4. Step 4: Simplify right side
   114.42x = 17,256.85
5. Step 5: Solve for x
   x = 17,256.85/114.42
6. Step 6: Final answer
   x = 150.82